Of course, nobody is killing Microsoft because nobody plays as well in Microsoft’s prime space, the enterprise. MS simply has to learn the hard lesson that Ballmer never learned, that you can’t own every single market.
I think Microsoft’s intent is to not own every market, but be like Wal-Mart and have a significant action in every market. If, in every tech market, Microsoft had 20% of the action, it would probably be the largest tech company on earth.
The financial problem for Msoft is that many enterprise users are (rightly) conservative about rolling out upgrades (our company went to Office 2007 in 2012 and Win 7 in 2013), whereas the iOS using public are mostly jackdaws who can't resist buying the newest shiny thing.